[R] gc(), memory.size()

From: r user <ruser2006_at_yahoo.com>
Date: Sat 06 May 2006 - 01:16:16 EST

Can someone please explain for me what the vcells and ncells “used” column means when I run gc()?
> gc()

           used (Mb) gc trigger (Mb) max used (Mb)
Ncells 882296 23.6 13812157 368.9 19400892 518.1
Vcells 14811586 113.1 114763459 875.6 317464335 2422.1

(I read the help file , but still do not fully understand?)
Also, how do I determine the total memory being used?Do I simply run memory.size()?
Finally, when I run memory. size(max=T), I get a negative value. What does this mean

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